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gzip_compress.go
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gzip_compress.go
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// Copyright 2018 xgfone
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package middleware
import (
"compress/gzip"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/xgfone/ship/v2"
)
// Gzip returns a middleware to compress the response body by GZIP.
func Gzip(level ...int) Middleware {
glevel := -1
if len(level) > 0 {
glevel = level[0]
}
return func(next ship.Handler) ship.Handler {
return func(ctx *ship.Context) error {
if strings.Contains(ctx.GetHeader(ship.HeaderAcceptEncoding), "gzip") {
ctx.AddHeader(ship.HeaderVary, ship.HeaderAcceptEncoding)
ctx.SetHeader(ship.HeaderContentEncoding, "gzip")
resp := ctx.ResponseWriter()
writer := ship.GetResponseFromPool(resp)
newWriter, err := gzip.NewWriterLevel(writer, glevel)
if err != nil {
return err
}
defer func() {
if writer.Size == 0 {
ctx.DelHeader(ship.HeaderContentEncoding)
ctx.SetResponse(resp)
newWriter.Reset(ioutil.Discard)
}
newWriter.Close()
ship.PutResponseIntoPool(writer)
}()
gzipWriter := &gzipResponseWriter{Writer: newWriter, ResponseWriter: resp}
ctx.SetResponse(gzipWriter)
}
return next(ctx)
}
}
}
type gzipResponseWriter struct {
io.Writer
http.ResponseWriter
}
func (g *gzipResponseWriter) WriteHeader(statusCode int) {
if statusCode == http.StatusNoContent {
g.Header().Del(ship.HeaderContentEncoding)
}
g.Header().Del(ship.HeaderContentLength)
g.ResponseWriter.WriteHeader(statusCode)
}
func (g *gzipResponseWriter) Write(b []byte) (int, error) {
if g.Header().Get(ship.HeaderContentType) == "" {
g.Header().Set(ship.HeaderContentType, http.DetectContentType(b))
}
return g.Writer.Write(b)
}
func (g *gzipResponseWriter) Flush() {
g.Writer.(*gzip.Writer).Flush()
}